764215506 has 64 divisors (see below), whose sum is σ = 1728000000. Its totient is φ = 250310736.

The previous prime is 764215493. The next prime is 764215531. The reversal of 764215506 is 605512467.

It is a happy number.

764215506 is a `hidden beast` number, since 7 + 642 + 1 + 5 + 5 + 0 + 6 = 666.

It is a super-2 number, since 2×764215506² = 1168050679221672072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1531245 + ... + 1531743.

It is an arithmetic number, because the mean of its divisors is an integer number (27000000).

Almost surely, 2^764215506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 764215506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864000000).

764215506 is an abundant number, since it is smaller than the sum of its proper divisors (963784494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

764215506 is a wasteful number, since it uses less digits than its factorization.

764215506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948 (or 942 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 764215506 is about 27644.4480140226. The cubic root of 764215506 is about 914.2646927807.

The spelling of 764215506 in words is "seven hundred sixty-four million, two hundred fifteen thousand, five hundred six".